Australian Jordan Thompson has been knocked out in the second round of the Citi Open 6-4 1-6 7-6 (7-4) by Ukrainian world No.37 Alexandr Dolgopolov.

Thompson fought back from 4-1 down in the final set before ultimately falling 7-4 in the deciding tiebreak.

After dropping the first set 6-4, Thompson rebounded to drop just one game in the second to send the match to a third.

Thompson’s second round defeat came after fellow countryman Sam Groth was sent packing in the first round of the Washington tournament, losing a tight clash 7-6 (7-3) 7-6 (7-5) to American Brian Baker.

The Australian was dominant on his own serve, but unable to break Baker’s serve.

Groth sent down 18 aces – double the amount of Baker, and did not face one break point in the match, however he won just 22 points on return of serve.

It continues a horror year for the 28-year-old, whose ATP Tour record has now dropped to 4-13 for the season, while his ranking has slid 101 places since August last year to No.154.

Groth isn’t the only one having a horror year in 2016, he was joined on the Washington scrapheap by Bulgarian 12th seed Grigor Dimitrov.

Dimitrov fell in his opener to British world No.82 Daniel Evans 6-4 6-4 and has slipped to a ranking of 40.

The loss is also his seventh first round exit in 2016, with his third round appearance at Wimbledon breaking a run of five consecutive first round losses.

Australians John Millman and James Duckworth progressed to the second round of the tournament on Monday (Tuesday AEDT), while Bernard Tomic had a first-round bye, Tomic will face American Donald Young in the second round.